JPH09166137A - Parallel biaxial slider structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure high-precise and smooth reciprocation, to improve durability of a device, and to simplify assembly, in a parallel biaxial slider mechanism. SOLUTION: A slider structure is formed in such a manner that a moving body 4 is reciprocated through slide bearings 14 and 17 along two guide shafts 1 paralleling each other. At least one of the slide bearings 14 and 17 is held at a moving body through an elastic material 20. When a size precision error occurs to a center distance between two guide shafts 1 and there is a deviation in parallelism, during reciprocating operation of the moving body, a size error is absorbed through elastic deformation in such a way that the elastic material mounted on the slide part is compressed according to a side error.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel biaxial slider structure used in a reciprocating mechanism of various automatic machines.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional parallel biaxial slider structure. It has a pair of guide shafts 1, 1 extending in the vertical direction, and the upper and lower ends of the guide shafts 1, 1 are supported by an upper plate 2 and a lower plate 3, respectively, so that the guide shafts 1, 1 have a predetermined axial distance. The movable body 4 is fitted to the guide shafts 1, 1 via the two sliding portions 5, 5, and can slide along the guide shafts 1, 1.

The sliding portion 5 is composed of a housing 6 having a through hole 7 in the bottom, which is a cylinder having a bottomed cylinder upside down, and a slide bearing 8 fitted and held in the housing 6. Sliding part mounting holes 9, 9 into which the housings 6, 6 of the two sliding parts 5, 5 are fitted and fixed are formed in the movable body 4.

Therefore, the movable body 4 is fitted to the guide shaft 1 via the housing 6 and the slide bearing 8 and is slidable along the guide shaft 1.

[0005]

By the way, in the parallel biaxial slider structure of this type, both guides fixed to the upper plate 2 and the lower plate 3 in order to realize highly accurate vertical reciprocating movement of the movable body 4. High machining accuracy is required between the axial distances L1 and L2 at the upper and lower ends of the shafts 1 and 1 and the pitch between the two sliding portion mounting holes 9 and 9 formed in the movable body 4. To be done.

In reality, it is difficult to machine the interaxial distances L1 and L2 and the interhole pitch with high accuracy. In order to deal with this, in the case of the above-mentioned conventional example, the two sliding portion mounting holes 9 and 9 are provided.
One of the two is bored slightly larger than the shaft diameter, and when the movable body 4 is assembled to the guide shafts 1, 1, the sliding portion 5 is finely adjusted and fixed to the sliding portion mounting hole 9. Therefore, the accuracy error between each member is absorbed.

However, in such a conventional precision adjusting means, a great deal of assembling time and skill are required for fine adjustment when fixing the sliding portion 5. Further, in the case of improper adjustment, the reciprocating motion of the movable body 4 lacks smoothness, a trace is generated on the sliding surface between the guide shaft 1 and the sliding portion 5, and seizure occurs over time, which causes seizure. There is a problem that it will stop the operation.

The present invention has been made in view of the above circumstances, and in a parallel biaxial slider structure, it is possible to ensure a highly accurate and smooth reciprocating motion to enhance the durability of the device and simplify the assembly. It is what

[0009]

SUMMARY OF THE INVENTION The present invention provides a parallel biaxial slider structure in which a movable body reciprocates along two parallel guide shafts through a slide bearing, and at least one of the slide bearings is elastic. When the movable body is held by a movable body, and the parallelism is incorrect due to a dimensional accuracy error in the axial distance between the two guide shafts, the movable body is reciprocally moved according to the dimensional error. The elastic material mounted on the sliding portion is elastically deformed by being compressed and absorbs dimensional error. As a result, a smooth reciprocating motion of the movable body is guaranteed, and a high degree of assembly precision is not required for the initial assembly.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those shown in FIG. 5 of the conventional example will be described with the same reference numerals.

As shown in FIG. 1, a pair of parallel guide shafts 1 and 1 extending in the vertical direction are provided.
1 has an upper plate 2 and a lower plate 3 each having an upper end and a lower end supported by a predetermined axial distance. The movable body 4 is slidable on both sides along the guide shafts 1, 1 via two sliding portions 10, 11, and a reciprocating actuating device (not shown) is coupled to the movable body 4. To be done.

One of the sliding parts 10 is a housing 12 having a bottomed cylinder inverted and a through hole 13 at the bottom.
Slide bearing 14 fitted and held inside the housing 12
have. In the one sliding portion 10, an elastic material 20 which is a dimensional accuracy absorbing member formed in a tubular shape is interposed between the housing 12 and the sliding bearing 14. A rubber material such as urethane rubber is used for the elastic material 20, and as shown in FIG.
Alternatively, as shown in FIG. 3, the inner peripheral surface of the housing 12 is press-fitted and coupled.

The other sliding part 11 is a housing 15 having a bottomed cylinder inverted and a through hole 16 at the bottom.
A slide bearing 17 fitted and held inside the housing 15.
And consists of

The movable body 4 has the housing 12,
Sliding portion mounting holes 18 and 19 into which 15 is fitted and fixed are formed. Both of the sliding portions 10 and 11 have the guide shafts 1 and 1 inserted through the through holes 13 and 16 provided in the housings 12 and 15, respectively, and
Slide bearings 14 and 17 are slidably fitted to the slide bearing 1.

With the above structure, in the present embodiment, the axial distance L1 between the guide shafts 1 and 1 fixed to the upper plate 2 and the axial distance between the guide shafts 1 and 1 fixed to the lower plate 3 are set. It is assembled so that L2 is the same, that is, the two guide shafts 1, 1 are parallel. In the movable body 4, one sliding portion 10 is fitted and fixed in the sliding portion mounting hole 18 via the housing 12, and the other sliding portion 11 is provided.
Is fitted and fixed in the sliding portion mounting hole 19 via the housing 15.

Even if the guide shafts 1 and 1 are assembled in a state in which the vertical distance L1 and L2 between the guide shafts 1 and 1 has a deviation in parallel accuracy, the accuracy error is one sliding portion 10
It can be absorbed by the elastic material 20 provided in the.

That is, when the movable body 4 is reciprocated in the vertical direction in the figure by being guided by the guide shafts 1, 1, one sliding portion 1
At 0, the elastic material 20 elastically deforms in accordance with the dimensional difference between the axial distances L1 and L2, and contracts or restores its original shape from the contracted state, thereby absorbing the dimensional difference between the axial distances L1 and L2. In this case, the elastic material 20 can also absorb a processing error between the sliding portion mounting hole 18 and the sliding portion mounting hole 19 on the movable body 4 side where the housing 12 is fitted and fixed.

Due to the dimensional accuracy error absorbing action of the elastic member 20, the movable member 4 can smoothly reciprocate on the guide shafts 1 and 1 even if there is a processing error between the members. That is, by allowing a slight accuracy error, the assembly can be performed easily and quickly.

In the above embodiment, one sliding portion 1
Although the structure in which the elastic member 20 is provided only in 0 is shown,
Not limited to this, as shown in FIG. 4 as the second embodiment, it is of course possible to mount the similar annular elastic member 20 on the other sliding portion 11 as well. In this case, due to the deviation of the parallelism due to the dimensional difference between the vertical shaft distances L1 and L2 of the guide shafts 1 and 1, and the machining accuracy error of the two sliding portion mounting holes 18 and 19 on both sides provided in the movable body 4, , The degree of absorption can be increased. Further, the reciprocating motion of the movable body 4 is not limited to the vertical direction, but can be applied to the horizontal reciprocating motion.

Further, in the present invention, although not shown, a structure in which the movable body 4 and the housings 12 and 15 on the sliding portions 10 and 11 side shown in the above-described embodiments are integrally formed is also possible.

[0021]

As described above, according to the present invention, when a dimensional accuracy error occurs in the distance between the two guide shafts and the parallelism is deviated, the dimensional error is met during the reciprocating motion of the movable body. The elastic material mounted on the sliding portion is elastically deformed by being compressed or the like, and the dimensional error is absorbed. As a result, a smooth reciprocating motion of the movable body is ensured, the durability of the device is improved, and some accuracy error is allowed, so that high processing accuracy or assembly accuracy is not required.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing a first embodiment of a parallel biaxial slider structure according to the present invention.

FIG. 2 is a cross-sectional view showing a structure in which an elastic material, which is an essential part of the first embodiment, is baked on the outer peripheral surface of a slide bearing of a sliding portion.

FIG. 3 is a cross-sectional view showing a structure in which an elastic material, which is an essential part of the first embodiment, is press-fitted into a housing of a sliding part.

FIG. 4 is a front view with a partial cross section showing a second embodiment.

FIG. 5 is a front view with a partial cross section showing a parallel biaxial slider structure of a conventional example.

[Explanation of symbols]

 1 Guide shaft 2 Upper plate 3 Lower plate 4 Movable body 10 Sliding part 11 Sliding part 12 Housing 13 Through hole 14 Sliding bearing 15 Housing 16 Through hole 17 Sliding bearing 18 Sliding part mounting hole 19 Sliding part mounting hole 20 Elastic Material

Claims (1)

[Claims] 1. In a parallel biaxial slider structure in which a movable body reciprocates along two parallel guide shafts via a slide bearing, at least one of the slide bearings is held by the movable body via an elastic material. A parallel biaxial slider structure characterized by being made.